cam_pos      = [0.381472, 1.82472, 0.83025]';
cam_dir      = [-0.935111, -0.273074, 0.225826]';
cam_up       = [-0.332622, 0.456678, -0.825111]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.162507, 1.12609, 0.688774]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;